The invention discloses a boiling water heater, which includes a barrel shape internal tank body, a water inlet pipe, a water outlet pipe and a exhaust pipe, the upper end of the tank body, fixedly and hermetically connect to the first upper cover, the first upper cover is fixedly and hermetically connected to the second upper cover. One cavity is formed between the first and second upper covers, water inlet pipe passes through the second upper cover. An exhaust hole is set on the inner wall of water inlet pipe to connect to the cavity, a separation plate extended to the middle which is above the exhaust hole on water inlet pipe's internal wall. The invention has the characteristics of convenient installation and disassembly, convenient cleaning, and can ensure the quality of water flows out, and the production cost is low, and very safe for use.

A multiple-piece vacuum-insulated heating tank for use in a water dispenser includes a threaded cover, a thermal insulation cover, and a heating tank body. The threaded cover is mounted on an upper opening of the heating tank body and includes a plastic cover and a protective cover mounted on and around the plastic cover. The thermal insulation cover is fitted in the upper opening and includes an upper cover and a lower cover. The lower cover is cup-shaped; is mounted with a heating tube, a water inlet pipe, a water outlet pipe, a thermowell, a temperature-sensing heat pipe, a heat collector block, and two snap-action thermostats at the bottom side; and has a sidewall formed with a step adjacent to the bottom side. The heating tank not only has a multiple-piece structure that facilitates mass production and maintenance, but also dispenses with electronic temperature control as is conventionally required.

An electric water heater having a water holding tank defined by a cylindrical side wall, a top wall and a dome-shaped bottom wall. A cold water inlet is disposed for releasing water under pressure in a lower portion of the tank. Two or more resistive heating elements heat water in an upper and lower region of the tank. The lower portion of the cylindrical side wall and the outer circumferential portion of the dome-shape bottom wall form a circumferential cavitated area inside the tank in which sediments deposit forming a bed in which bacteria can proliferate. A conduit is secured about at least a substantial circumferential portion of an outer surface of the cylindrical side wall adjacent the cavitated area. A resistive heating wire is disposed in the conduit and has connection leads extending out of a free open end of the conduit to an access area to provide connection to power terminals and a control for controlling the supply of power to the resistive heating wire.

A multi-functional retrofit cover plate assembly and method for an electric water heater to provide interconnection with an alternative energy system to heat water in a water holding tank of the electric water heater. The cover plate is adapted for replacement connection over a bottom access opening formed in an outer casing of the electric water heater which permits access to a bottom resistive heating element and electrical connections. The retrofit cover plate is shaped to define an internal dedicated compartment. A dual resistive heating element is provided for replacement of the bottom resistive heating element. An electronic switch unit is further provided and it has a power cut-off switch for connection to an alternative supply voltage. A temperature sensor is provided for mounting against an outer surface of the tank of the water heater to feed actual temperature signals of water temperature within the tank, in a lower region thereof, to the electronic switch unit which operates the power cut-off switch upon a predetermined temperature having been attained in the tank of the water heater. The retrofit cover plate and the assembly also make it possible to covert the water heater to a high temperature water heater or to adapt the electric water heater to a thermal fluid heat source.

A solar water pasteurizer has a water jug removably disposed in a solar box with insulation and a solar window. The water jug has a lid to close an aperture in the solar box and a handle thermally isolated from the water jug to facilitate handling of the water jug with heated water. Multiple water jugs can be swapped in and out of the solar box. The solar box also has a thermal mass to preserve some heat in the solar box.

An electric water heater is described and wherein the bottom portion of the water holding tank is provided with various forms of electric heating elements to heat the water in the lowermost region of the tank adjacent the dome-shaped bottom wall to a temperature sufficient to prevent the proliferation of bacteria growth such as the Legionella bacteria in such lowermost region. The insulating foam support base of the water heater also provides a thermal barrier to the heating elements while biasing the heating element on the dome-shaped bottom wall in a region to insure excellent heat transfer to the cavitated zone surrounding the dome-shaped bottom wall where sedimentary deposits occur to create a culture medium for bacteria growth.

A method for insulating a gas-fueled water heater includes providing a tank for storage of water for heating and a combustion chamber adjacent to the tank. The method includes providing a compressed foam barrier circumferentially around the tank. Further, the method includes positioning a covering around the tank from a top end to a bottom end, the covering extending over the compressed foam barrier. Moreover, the method includes decompressing the compressed foam barrier such that an outer diameter of the foam barrier expands up to and seals against the covering so as to separate an internal volume defined between an outer surface of the tank and the covering into a first section and a second section. Then, the method includes injecting a foam material into the first section so as to provide a foam barrier around at least a portion of an outer surface of the tank.

An assembly having a structure provided with an interior volume in which is present for example at least one fluid capable of circulating in said volume and under the action of circulation means. Thermally insulating elements of VIP construction are arranged around a layer containing a PCM and extending around the peripheral wall that surrounds the volume. Protrusions fixed to the peripheral wall delimit spaces in which the thermally insulating elements are positioned. A sleeve extends around the protrusions and the insulating elements.

An assembly comprising a structure provided with an interior volume in which is present for example at least one fluid capable of circulating in said volume and under the action of circulation means. Thermally insulating elements of VIP construction are arranged around a layer containing a PCM and extending around the peripheral wall that surrounds the volume. Protrusions fixed to the peripheral wall delimited spaces in which the thermally insulating elements are positioned. A sleeve extends around the protrusions and the insulating elements.

A liquid heater may heat liquid using at least one of an electric heater or a hybrid heat pump. The liquid heater includes a tank to store liquid, an insulator at an outer surface of the tank, and a case surrounding the insulator. The case includes a first outer panel, a second outer panel, and a cover panel fastened between the first outer panel and the second outer panel. The cover panel is detachable from the liquid heater to access electronic devices such as a controller for the electric heater.